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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'edee44f01d68e5dd10915a62a6df66d2c208dd127308ea5fcb84cc227d6878e1' 
  AND token = 'WXFnQQ02cFJZyfECk0SG1h4Jk+ah9Mld/VwnKhlCDGg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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