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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd0213128e6bf88104389f012a187793bc6b155d29975024efc16c4d7814a0594' 
  AND token = 'y+gWeBDEAeoZx1U/cwEKwcow8vZOicoP5NlxwdxtesA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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