Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2ad21f85a25b15eb010bef54a0da02cad872cce39e028a299aa4e8d217a0bcd0' 
  AND token = '+aEXcwETRy3+Vblt7WezBNRThYVbh3n+pMgiXXO9s48=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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