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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '04c5066c577822e42bef2b7414d6a67b31540f151ffec035a6d28fa47048075c' 
  AND token = 'TOdjEvyTN/cZ9Ch5zgiznz0PUjH8mLV8u+uOjfs3ids=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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