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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '930ab545c4787ec4ae8efee6c2f8d5f15b59f5b5d36cf0105833e8b869c0ed65' 
  AND token = 'Uf3hfL/3yeiARbcM2WlCaTvTI3MaEJ/6H4y+/bEeatg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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