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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '29af8b6cc3f4a4672c66ed515eafdcdc79bb5da9a35b4931f5f5829361056b0f' 
  AND token = 'd8rbHBoV8tcCzysERGH5tElGtqWPwz5tgxMb3/gmOCg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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