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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd365998a685a5fc62543a8615dc351c210fa71597af988d653be5f898d5cc1ff' 
  AND token = 'RLDOvFjX6W8YwEHwZVmXdbGYBF5RMJD+kobf0XX/8eQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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