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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0611d2a89d9908df9567d9787bb60e55ada0b8e53582c91a1a1e33f1f8a30853' 
  AND token = 'CcMzyUaFQ8UaqUzHYMvj2Ra8nkwqK9KCSoIWG8H3zwk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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