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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '175f5290a8a9a31ca39bb952226cf2d71c2fbd5699dda07634ba3c654d2cd364' 
  AND token = 'GRuy10vTsSLofD8/bKne67Qe/TcVcEddqAbuzPl+pJU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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