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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f546f09a4758b44b90b481f90328291764dd74fd5f84afae130ba00e3a7baad4' 
  AND token = 'FJYB90YgFtSUkR3p2PIpKtpWElFrLsDHZjcNhjR/TDA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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