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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b2355b25e11d4229330e343dbd273790e1250801a5c5b79bab7fff6dd3626cda' 
  AND token = 'X5rnOwbRoxsR0J7f7ERrUw0xjHrrkN4Sl8Ov0I4d9hM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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