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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c3b1d62f7aecf247ab8ece756c34aa303c95781094c39cfee63449c21098c901' 
  AND token = 'LP83Li3A19WaMKlCkoyzDOCJ011AJjm/AEMB+b23qlc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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