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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da67dff57efe3ed2707aac9a1306b665a543b75ef5048dc7e86e20a400767055' 
  AND token = 'cs4wFmXT3BXy2u0TZ6j8Hhe9yHU2cbLb8fkWtUvyibA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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