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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dcffd5498d8ab6874cd49d303d4d83b9ec87821065a08b5f4a89dc12d958e6e9' 
  AND token = 'bi1RAfgI1ERgRYe52dxTKSRr9N9FA2NwtTPNxKqTeIQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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