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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1101efd2d563af385b826c66756a1e8734a10cd683c63a4581ff2794d0145bee' 
  AND token = 'MQ+huLNxGvUxKzLXg6CTvJ98hbsiTMbwODxkUz6e+Mk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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