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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0693b823bd83b46235a0d3ab7ae346a18b0da9f9542e4320672404643606cff4' 
  AND token = 'zgi4OvDYY9dOKzdP3OYxPUPzpoaCj8mo5fP5xa+xQpM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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