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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fac8f02d0b7f430ec72900802ce9cee1b1cfea200cea92be82ffd33a0a05a438' 
  AND token = 'PpUwnMqWi+lQOLwU6fwbrmlbhfaIYoZ0g9bxszKkvFc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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