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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '894a3af0bc7841133af64fdd6736bf4e92378c939d8e76c928e378a928537b45' 
  AND token = 'mlw8aNvfexZrC5Gs9IMwiZYGLTO7EkZvnDSaND9zX3o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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