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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '69a051aac20bf1ab4ab51af8014853e21b4a56e44dfad356263d671fc9996b29' 
  AND token = 'ovAGguzGc7vwwH2f1WBfnIrcYWg1D4n8h8/j98rWIQI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00248

JSON explain

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