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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3e68ae403585b4f0b694ee0fa30e693be419b04a3237129bea5bae9e748f9563' 
  AND token = 'kO9fNQrSoM88EYxo1GOjGp7IlY1nx+aze2BX+oE38XI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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