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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0accf4b9314ae447ecfc953f5f7d61bcf2491975bc3dc2f913a9a89da80cd674' 
  AND token = 'RWXrr1drDZcupuavbPjDT5TXvW5BUI6nH+vRGn9Nx/Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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