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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6844885d5d6d76f5ce040012fc522c58ed08825c0dbbc7a8e750fd87aa6f099b' 
  AND token = 'hTwvyL9+DiCnuNMkBl1zeFMlJVZaetIALYWJ4z9IHSg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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