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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96d0eba98f67e94671ee750af4cae8b71f253f183a9937bfd673dff135da302c' 
  AND token = 'nVdNtO4Vz3EMqIktdgYlsydZQmDEjpTtZKvDWbSi6XU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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