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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1435553d5ddf69ee7fc34b6867a9e6b59eb0bc509c5d705d38295bc0e46497a0' 
  AND token = 'TtAjKHjWMbxiQ8ciigInnMe/b02Iyelp6Fxi/0tTKik=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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