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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '29e0f95ac775ae3cdbaa23234c1a7a4c12ba329dcd7e8ae984d0928364259b92' 
  AND token = 'K3wSWc1QQvwqyPM5Z3V9j8epyXUmVOhO4h9/Kh827xw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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