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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ddf58956459131c9ab3cb5fb46aa297b6416824e512ea2844e0674884c2808d6' 
  AND token = 'K8iBldwBZUbV8mj4NJ8yxzUKVSxGnt2iLSeP31ok0Tg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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