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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e0ee17773ed5c974cf53de4132e8ae197fb8566ae07c0b6de0e8518800ca166a' 
  AND token = 'SmsnoUjbjC4a4828XsinmkJKb4RBxHEf0/YPWkS5m0s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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