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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f3738edb92928ceacaa3c84d561a6cc5d0c19b8aa594e7229d27df0e024397ed' 
  AND token = 'd0+dHP2okDaQl9DZIK6Pl69osS7oYTew7ts7wZfXnkA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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