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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3027230427a063d197171ac2c5f0786284c4fde91b2c3fbbc6d7e85045e6fc77' 
  AND token = 'WEzrIeYweyycF1QOjmjUOT5z4SiD8hoyY8cmILCK3cU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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