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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7915c429e63df05f95b9bbf0503a877e2c0dc937946c85722d066f975b45edd9' 
  AND token = 'TCeITmcKOEtun/L59RlpM6/2Hh0EIIYo3wezVWBrams=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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