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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '791e171ac5c287cb29492d6d906e6c5a5722743472b584edfedc3294420673aa' 
  AND token = 'pkyTyFYwKLwlWX5rONma2O7BKw9I9IduIO3VAv5mHXM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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