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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd308a3e208ae801f8cbcdbe86de4d4f3451823b5e29be60b2c1ab97b62271c41' 
  AND token = 'wS+tK1OfGHFg3nf9d/Su6nXtZQ6LEQ/p7xKsLD7y7c4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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