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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '541981475ad0b1dd3415f32c1c2e17358810bf0ebc45606532cd199fafb5ad40' 
  AND token = 'doK9eFyP3G0Efb6RLMndhqy8iz8pm5mgmHFXBxCrz6U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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