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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0b469c328e6ca61b30455852914cbed44dd916f0b041d909dbe3a84468021cfb' 
  AND token = 'yWqmVnACGq+IjHjY3nMdfCmk+ULm4ZO4tNQUDIJsd8I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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