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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd87a497fe7f658b5c7723833f9183522965960a2bb16d12a742ef7e36aa7fcde' 
  AND token = 'TxL7CaXjct0dZSxa5R3j9FCxjDtAkAy+IB27sr2lzkE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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