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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ac37ac26470f90dc42ac75f67420391dd0a7119ce130c0f45aece41de9f75ca' 
  AND token = 'qsXs6YaMTCMsh2AQdJ4XDoozQpYInLeZww7QNT4Rok4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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