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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b31867176b952b5e6d2addbf041f838d719ded660552fb8d68630a4cd1d02e1e' 
  AND token = 'scyCwEmLQ5BtNoEERxQ7vDQZSINAvOz8Atw+UOgXVj0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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