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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3648adbf3bd2cd743b185505ef06461322b888fedb493092e9840c71c01087de' 
  AND token = 'yFp7VhC8gOTrfw9u3CyuzM1FxJzJjWzYpjrkEUTyz8M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00092

JSON explain

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