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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93b11f1b01f222e0d1844d349e7af9271400b24d7206c9ca1d104cb47a2fa53b' 
  AND token = 'tMw2IjliG3lHZRNHlCqZz8xGaXzHyeOfEFk9Usn72/M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00062

JSON explain

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