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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'de979acbb687630a5ed48c019c12c6a1799b6bdd8fa671299b2768348accea30' 
  AND token = 'jZvdM5x0zwKeV8am4gPGtJv5jaq4AcvL82ugVGw8/xc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00177

JSON explain

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