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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5da68e56d586ff535fe5554309640ed7f4c0e1194c705f1dcafb6c4d622d15fb' 
  AND token = 'M0TqcB2ObAl1C9Tghj2JKeBZbdbRMWSIU8MXiOCB+Q8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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