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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e122fc2f23f1308bfb07a34d906e9edf0e235a349f1c4b9223ef7c8842c98de2' 
  AND token = 'uHgkdvKQjxU2bUzywYyh0HgetWeZlaDK9+Xl3z9uULY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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