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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '97fa92b927c049493c4f5ad5d04c6d7bbc3b7b563fae2f2fc9ce2c847efcd7c8' 
  AND token = 'XWLkeoZJ1dqyft+RoFdpdL8SzGFpUtejJugqxT4TkWA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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