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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55ecb6560af7407ee2233468f946e562311b06b2123c4737c8574abbd78cdddc' 
  AND token = '8uEFmAP7zor6ZmdtrxQjUV6TS/9uw0v9g4VzidSAayw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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