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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8c926d07678d96ea1871e41695e49b5fe9ec9390de881152afc4d011f02e64d8' 
  AND token = 'cpfqaMVuWecRTzv3zbv+/EbRf9rbtGh1B+2o0kYK9Gs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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