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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bec63e1c226e9573afefe60fd05fc68f681575ff34e67e984e3087e86548ec60' 
  AND token = '2Q5JdfkpHNc+447us8LIYwcRyyk4VOO4LyOEVFcr/U4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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