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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c619d2e2068264cf69daab2d6b0462604e0ac7f0ef77702739916d9c1ce1020c' 
  AND token = 'VpN+tiUYtqV2boG91/4Tbrp5/9lE3zp7YbAp1hfeexk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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