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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '909fe715dc880e32ec6c72d952de5db007417aa698b36774d03440a79303e65a' 
  AND token = 'vZMVexbyobOK/Bv5L1nNVLg64IoMTXb/syKbg48ez54=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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