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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d972b3ca3fc8a5a9d915e61dc95322e9af5e1b36f148c88cdd44bba901f9f99' 
  AND token = 'RiAlAABmOIwRRb0ZTyzUVl45F3bmyACgpFG0wZTp6fM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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