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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96ce04c86bc44ad8f1282a85a56c589d178f9ca8391ed6bd296605b34cb4c768' 
  AND token = 'USxWh4rWUmWi3uOsMkIwTZ2D/SmAs7mlPMbGHcO9d5M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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