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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '63fae878d503f0ed7abc56ab2dcb64eb738656e6a06a36052e0dff1b827415cc' 
  AND token = 'aGEd1cWqU5oMR6XMK2MUMH/GMq5GCGG3I6+QiR9s7Ik=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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