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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a882ee3da3c2972e2698cd18470ca3c76c3611410322046864b77d399b479b8f' 
  AND token = '0Msn1L1Z2G7qYwHoTN/lSgToftjBeABN1hQpxs/XHzw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00108

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}