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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'df6efbdd936920e43ddd29f2fcd9b18b4ca67fe9bb0da4c60d0c9ef98f4bd820' 
  AND token = 'wjQ0kHq6zxoWxStylSLd8YT2YMAheSjAFddcXsxvKP0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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