SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2aa9425159bdb3c87229b7f952871f54b90c2acc7564251be6278c485dfcd8b5' 
  AND token = 'CQxGgwNyzqjIW3CB/Zw9KTZCEGlTrXM7diS/tqfpvRQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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