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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b648c6c7be83bb433aaf5a6c2a47f6064d7aaef6275e0c3e6f05558e7a47fba6' 
  AND token = '5QWPAJxwI79SXdVDWkLcju7L74LxrKubUNpV71wOnYY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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