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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5be9455e525acbc6fa191e6996e63283332cc58d8a0a893e0bf72b2728b53dd3' 
  AND token = 't4M3UvvtmKlQRGmbV+DL8iu1B77Y9O8pIfeqvb807RM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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