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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7bba1b2c12d1c9752691ab2c48beab04eaa52c3222a047815ae1a55f25612f68' 
  AND token = 'kih7T2ZFfsnZbSrwsz+4PgLz5at+/WJkz5EPYiYX/xU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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