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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be65c964b723ec5d39c8ced65d734acc1bbd3af61d057fb2f6de351214764d2d' 
  AND token = 'MmU6fOhDPsA5hJVqz2FEoeoGz5UAgWH8Wg2G4IT2yy0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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