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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8faf39b4b759338b30f1642d01b777c07b0af821caa5438ea707b031249f588c' 
  AND token = '5Hx15c/JW4UBBfiignJQ99fIOhgiP9YFnwBLG17S6Ho=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00079

JSON explain

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